Ordered this cooktop a couple of months ago and have loved it ever since.  We replaced another cooktop that claimed 19,000 BTUs on its main burner and it would take up to 45 minutes for a large pot of water to boil.  This 21,000 BTU burner just brought a very large stock pot with two chickens (still slightly frozen) to boil in 17 minutes!  I did have to adjust small burner down a bit because it was too much heat for simmering purposes.